Each pack contain 10 orange balls representing bromine atoms and the diameter of each atom is 23 mm. Smaller 17 or 20 mm atoms are available separately.

This item is for extending an existing set or for replacing lost parts.

The Molymod® system is the original, unique, dual-scale system of high quality low-cost molecular models. These enormously popular sets are ideal for students but are also used by scientists all over the world.